Mix graham crumbs and butter until well blended. Microwave chocolate on medium for 2 minutes or until melted. Mash 1/2 cup each strawberries and raspberries in medium bowl. Beat cream cheese spread in large bowl with mixer until creamy. Gradually beat in milk. Blend in melted chocolate, mashed berries and zest. Whisk cool whip. Spoon half the cream cheese mixture into plastic wrap lined 9x5 inch loaf pan; top with half the crumb mixture. Repeat layers. Freeze 6 hours or until firm. Remove dessert from freezer 15 minutes before serving. Finely chop remaining raspberries and blueberries. Invert dessert onto platter; remove plastic wrap. Spoon berry mixture over dessert.